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TECHNICAL PAPERS

Infrared Imaging of 2-D Temperature Distribution During Cryogen Spray Cooling

[+] Author and Article Information
Bernard Choi, Ashley J. Welch

Department of Biomedical Engineering; The University of Texas at Austin, Austin, TX 78712

J Biomech Eng 124(6), 669-675 (Dec 27, 2002) (7 pages) doi:10.1115/1.1517276 History: Received April 01, 2001; Revised June 01, 2002; Online December 27, 2002
Copyright © 2002 by ASME
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Figures

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Schematic of possible: (a) front-side and (b) back-side infrared imaging setups for determining the front-surface temperature distribution during cryogen spray cooling.
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Diagram of experimental setup used to measure the back-side temperature distribution during cryogen spray cooling. DDG=digital delay generator, DCD=Dynamic Cooling Device.
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3-D plots of mean back-side temperature distributions estimated from infrared images at (a) 10 ms, (b) 40 ms, and (c) 100 ms after the onset of a 100-ms cryogen spurt.
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Average line profiles of back-side temperature distributions at the end of cryogen spurts of varying duration. Line profiles were taken through the approximate center of the cooled region.
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Cooling temperature distribution versus radial position for 20–100 ms cryogen spurt durations. The profiles were obtained by normalizing the temperature distributions measured with the infrared camera (Fig. 4) and setting the minimum temperature to −58°C, which is the assumed cryogen temperature at the center of the spray (see Ref. 20).
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Temperature differential plots calculated at the end of (a) 20-; (b) 40-; (c) 60-; (d) 80-; and (e) 100-ms cryogen spurts. The y-axis represents the difference between the temperatures calculated assuming a uniform cooling distribution and those calculated assuming a nonuniform cooling distribution. The four curves in each plot represent radial differential temperature profiles calculated at depths of 0, 60, 150, and 400 μm.

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